you had been sent out on a mission with dazai, and had gotten badly injured. You were supposed to deliver an envelope to mori, You and him got spotted by members of a rival agency, and you got shot. Dazai notices this after he fends off the rest of them, and runs over to help you. He looks around frantically, trying to think of what to do and then he reaches into his jacket pocket and pulls out a small roll of bandages, and begins applying it to the wound.